Time Stamp / DISTINCT conflict.

Question

In my following SQL query, I want to display records order by Date and Time. But it is conflicting with DISTINCT clause at the begining. When I remove TimeIssue from Order By, the query runs fine. I also want to know how to optimize the performance of this query.
SELECT Distinct TmainEntry.DateIssue, TmainEntry.IndemNo, TmainEntry.PermitNo, TVisitorComposition.A12I, TVisitorComposition.C12I, TVisitorComposition.C5I, TVisitorComposition.A12F, TVisitorComposition.C12F, TVisitorComposition.C5F, TMainEntry.TotalVisitors, TMainEntry.NumVCam, TMainEntry.BookingType, TFees.EntryFee, TFees.VehicleFee, TFees.GuideFee, TFees.CameraFee, TFees.TotalFee, TMainEntry.ServiceCode
FROM TMainEntry, TVisitorComposition, TEntryDates, RoundsInfo, TFees
WHERE TMainEntry.PermitNo=TVisitorComposition.PermitNo and TMainEntry.PermitNo=RoundsInfo.PermitNo and TMainEntry.PermitNo=TFees.PermitNo and TmainEntry.DateIssue between ' 01-sep-2006' and ' 30-nov-2006' and TMainEntry.PermitStatus<>'C'
ORDER BY TMainEntry.DateIssue, TMainEntry.TimeIssue;

Answer 1

With DISTINCT, each ORDER BY item must also apppear in the SELECT list.
What is displaying the error? It doesn't look like an Oracle error. These normally begin with something like "ORA-", for example,
SQL> SELECT DISTINCT 'x' FROM dual ORDER BY dummy;
SELECT DISTINCT 'x' FROM dual ORDER BY dummy
ERROR at line 1:
ORA-01791: not a SELECTed expression